A fix to @funju47shin pull request - #1

Author: joshbenham

src/Message/DirectPostAuthorizeResponse.php

@@ -4,11 +4,12 @@
 
 use Omnipay\Common\Message\AbstractResponse;
 use Omnipay\Common\Message\RequestInterface;
+use Omnipay\Common\Message\RedirectResponseInterface;
 
 /**
  * SecurePay Direct Post Authorize Response
  */
-class DirectPostAuthorizeResponse extends AbstractResponse
+class DirectPostAuthorizeResponse extends AbstractResponse implements RedirectResponseInterface
 {
     protected $redirectUrl;